Champion LED

1
Champion LED

• OYO BUTURI, Vol.74, No.11,p.1423-1432
  (2005)Development of high-luminance white light
  source using GaN-based light emitting devices
  Yukio NARUKAWA, Shin-ichi NAGAHAMAHiroto
  TAMAKI and Takashi MUKAI
• The luminous efficacy of the white light
  emitting diodes (LEDs) at 20 mA reached 70 lm/W
  and 113 lm/W at the product level and laboratory
  level, respectively. The chip sizes were 320
  µm320 µm. The luminous efficacy of the white
  LEDs became greater than the typical efficacy of
  a fluorescent lamp (75-100 lm/W). In addition,
  the luminous flux of the white LED using a large
  LED chip (1 mm1 mm) was enhanced to 85 lm when
  it was operated at 350 mA. Moreover, the new
  white light source was fabricated by using
  GaN-based laser diodes (LDs). The brightness of
  the new white light source was much greater than
  that of white LEDs. The GaN-based white light
  source will replace conventional lamps and bring
  us solid-state lighting in the near future.
• Nitride Semiconductor Research Laboratory,
  RD Division, Optoelectronics Products Business
  Unit, Nichia Corporation LD Development
  Department, Engineering Division A,
  Optoelectronics Products Business Unit, Nichia
  Corporation LED Back-End Engineering
  Department, Engineering Division B,
  Optoelectronics Products Business Unit, Nichia
  Corporation

2
Nichias Champion LED 113 lm/W

• 1. Schematic cross-sectional structure of (a)
  conventional LED and (b) new high efficiency LED.

April 2004 Optics Photonics News
3
SP Enhanced HB LED ?

• (a) Top view of the high Efficiency blue LED
  Operated at 20 mA and (b) enlarged Photograph of
  area A in (a). A

April 2004 Optics Photonics News
4
New High Efficiency Commercial LED - Nichia
5
Spectrum of Blue LED, Yag and New Red Phosphorus
Which lead to improved Ra

• YAG (Y1-aGda)3(Al1-bGab)O12 Ce3. Red
  (SrCaSiNEu) JJAP 42,L20(2003)

6
High-color-rendering index white LEDs

• 5. Electroluminescence spectra of sample (a), a
  high-color rendering white LED, and sample (b),
  conventional white LED.

April 2004 Optics Photonics News
7
High-color-rendering index

• 5. CRIs of sample (a), a high-color-rendering
  (Ra) white LED, and sample (b), a conventional
  white LED.

April 2004 Optics Photonics News
8
High-color-rendering index

• CIE chromaticity coordinates of sample (a), a
  high-color rendering white LED and sample (b), a
  conventional white LED under various forward-bias
  currents (20, 30, 40, 50 and 60 mA). The
  blackbody radiation locus is indicated by the
  orange solid curve.

9
High-color-rendering index white LEDs

• 7. Photograph of warm white LEDs at 20 mA.

April 2004 Optics Photonics News
10
Nichias White LED (320 x 320 mm)
Cree
Light Emitting efficiency
Total flux
fluorescent
incandescent

• High performance LED at 20mA with efficacy of 113
  lm/W exceeding the efficacy of fluorescent lamp
  (100 lm/W)

11
Large LED Chip (1 x 1 mm)

• 85 lm _at_ 350 mA 1 Watt device Nichias White LED
  performance at the end of 2005

Oyo Butsuri, Vol.74 No.11 p.123-1432 (2005)
12
Laser Diode Pumped White LED

• Schematic of white laser diode Using GaN LD
  coupled into Silica Fiber to Pump Fluorescent
  material at the end

Oyo Butsuri, Vol.74 No.11 p.123-1432 (2005)
13
Type I White Laser LED

• White LD a) f- I curve for type I LD
• b) Spectrum at different
  luminescent intensity

Oyo Butsuri, Vol.74 No.11 p.123-1432 (2005)
14
Type II White Laser LED

• White LD a) f- I curve for type II LD
• b) Spectrum at different
  luminescent intensity

Oyo Butsuri, Vol.74 No.11 p.123-1432 (2005)
15
Characteristics of type I II White LD
16
Junction Temperature Change

• Junction and package temperature change of type I
  and type II white light LD without and with heat
  sinking

17
Performance of White LED verse HID

Oyo Butsuri, Vol.74 No.11 p.123-1432 (2005)
18
Color Temperature CIE Coordinate
19
Color Rendering Index

• With right combination of Yag and New Red
  Phosphorus one can achieve highest CRI, Ra gt 93
  for different Tcp

Oyo Butsuri, Vol.74 No.11 p.123-1432 (2005)
20
Spectral Contents of Various Light sources

• Halogen Lamp (Tcp 5000 K)
• 3 WL Fluorescent Lamp (Tcp 5000 K)
• Special High Color Fluorescent Lamp (Tcp 5000 K)
• CIE Standard Light (d 50, 5000 K)
• White LED (Tcp 4600 K)
• High Color White LED (Tcp 4600 K)
• Human eyes have highest sensitivity in the WL
  region 450 650 nm range. High Color LED and
  Halogen Lamp are Closer to Standard than 3 WL
  florescent lamp.

Oyo Butsuri, Vol.74 No.11 p.123-1432 (2005)
21
Conclusions

• Efficacy of white LED has exceeded that of
  fluorescent lamp.
• Small LED chips (320x320mm) achieved 70 lm/W and
  113 lm/W at Production and Laboratory level.
• Large LED chips (1mmx1mm) have achieved 85 lm at
  350mA driving current with efficacy of 74 lm/W
• A new type of white light source with fiber
  pigtailed GaN LD and new phosphorus materiel that
  separate light emitting region and heat producing
  region has create a light source brighter than
  that achievable by white LED
• With higher output power, higher efficiency and
  higher brightness white SSL light source can
  replace lamp type light sources. Many other
  applications can be envisioned that was not
  achievable with lamp type light sources.

22
Crees Champion LED 131 lm/w
3.2V Typical at 20mA
CxxxEZ290-Sxx00 Chip Diagram
CxxxEZR260-Sxx00 Chip Diagram
450nm EZR-24 - 24-27mW EZR-27 - 27-30mW
EZR-30 - 30-33mW 460nm EZR-24 - 24-27mW
EZR-27 - 27-30mW EZR-30 - 30-33mW 470nm
EZR-21 - 21-24mW EZR-27 - 24-27mW EZR-30 -
27-30mW

• 460nm
• - EZ-16 - 16mW min.
• - EZ-18 - 18mW min.
• - EZ-21 - 21mW min.
• - EZ-24 - 24mW min.
• 470nm
• - EZ-12 - 12mW min.
• - EZ-16 - 16mW min.
• - EZ-18 - 18mW min.
• - EZ-21 - 21mW min.
• 505nm - EZ-8.5 - 8.5mW min.
• 527nm - EZ-7 - 7mW min.

23
CxxxEZR260-Sxx00 Characteristics
24
CxxxEZ290-Sxx00 Characteristics
25
Cree Demonstrates 131 Lumens per Watt White LED
DURHAM, NC, JUNE 20, 2006
Achieved 2005
Achieved 2006
Achieved Cree 2005
26
M. G. Craford 2004
27
ITOMgF2

• Lithography and approved analytical tools (click
  for list) - Follow appropriate procedures for
  photo-resist cleaning to ensure against
  contaminating litho and analytical equipment.
• General-use wet-benches (click for list) - Use
  personal, designated glassware to minimize risk
  of cross-contamination. NOTE It is against
  California law to dispose of indium down the
  drain. Indium is a heavy metal and a
  bio-accumulative toxic substance. All indium tin
  oxide etching solutions and the rinse water from
  the first four rinses must be captured, labeled
  as Hazardous Waste, and picked up by Stanford
  Environmental Health Safety. You must be
  qualified on these benches before etching ITO.
  NOTE also S. Beckwith reports that sulfuric acid
  and 61 HF etch ITO
• Select tools in the Gold-contaminated Equipment
  Group (see below)- Wafers are considered gold
  contaminated following processing in any
  equipment in this group. NO ETCHING of ITO may
  take place in plasma etching tools. Refractive
  Index The refractive index for a film that is
  transparent in the visible region remains near
  1.95 and is not strongly dependent on the
  deposition parameters. Index is generally of
  secondary concern for conducting applications.
  The extinction coefficient will vary with
  conductance.

28
(No Transcript)
29
HB LED Lumileds

• Lumileds approach
• Reflecting contacts and flip-chip mounting

30
LUXEON Leds 80 lm/10

• LuxeonTM Power Leds offer significant advantages
  over standard Super-bright LEDS. With up to 80
  Lumens of Light output, they are very bright
  having the 35-40 lumens per watt which is 5 to 20
  time brighter then standard leds. highest flux in
  the world. The standard Luxeon White LED will
  produce
•  A LUXEON led will last an average of 10 years
  or 50,000 hours with correct voltage and current
  supplied to it, this means that they can be used
  to replace conventional lighting in many areas.
  They are more efficient then incandescent bulbs
  and most Halogen light sources and they are fast
  approaching the efficiency of Fluorescents.
• These LEDs are small, directional pinpoints of
  light which result in highly controllable optical
  systems with no wasted light. No moving parts,
  nothing to break, shatter or leak.
• The Vivid saturation colors of Luxeon enables a
  wide color gamut of dynamic lighting effects.
  Fully dimmable with no loss of color variation. 
  Starts up in temperatures as low as -40 C.
• No UV or Heat is contained in the Light output,
  But there is generated heat on the back off the
  LUXEON LED of which you will need a heat sink
  for proper performance and longevity the LED. You
  must order a Heatsink, otherwise you must fix the
  LUXEON to something that will draw the heat from
  the part.
• All LUXEON  LEDs are DC operation as low as 3.5
  v. See specs page for more information

http//www.fiberopticproducts.com/Luxeon.htm
31
High Power LEDs Osram

• Osram Substrate removal by laser lift-off
  (LLO)
• Thin film GaN InGaN on sapphire. Extraction
  efficient 75. Quantum efficiency (QE)38, 85
  lm/W Achieved.
• 1-mm emitting area show 400 mW optical power or
  70 lm white.

32
Concept of Remote Laser Lighting

Pump Light Source LD
Florescent
Light Emission
Optical Fiber

• Many different applications designed for
  fiber optics communication can also be used in
  lighting for example WDM can be used for light
  mixing, Using fiber pigtail one has Remote
  Lighting

33
RGB Edge Lighting LEDs for Flat Panel
Illumination

• 15 Diagonal Screen 2500 lumen 120W (20 lm/W)
  18,000 nits LEDs 24 Green 8 Blue 32 Red
  (64)